Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS


CirQys Berichtzusammenfassung

Project ID: 307778
Gefördert unter: FP7-IDEAS-ERC
Land: France

Mid-Term Report Summary - CIRQYS (Circuit QED with hybrid electronic states)

Cavity quantum spintronics

An electronic spin and a confined photon are complementary quantum mechanical objects which can be used to carry or manipulate quantum information. To combine them coherently would enable to manipulate and detect single spins but also to couple them over macroscopic distances thanks to the concepts of cavity quantum electrodynamics. This kind of architecture would allow one also to build quantum simulators for elementary magnetic systems.
Although progress has been made, in particular concerning the coupling of collective spin states or single charge states to cavity photons, no experiment had demonstrated so far the coherent coupling of a single spin to cavity photons. This problem arises from the fact that the natural coupling of a spin to the electromagnetic field is essentially magnetic, which makes it too weak in general to make it coherent.
The CirQys project could solve this problem by synthesizing an artificial spin orbit interaction in a single wall carbon nanotube connected to ferromagnetic electrodes. Such a setup implements a single spin spin valve in a double quantum dot. The device is embedded in a high finesse microwave superconducting cavity. The CirQys project led to the observation a very strong hybridization of the spin states in the nanotube and the photons trapped in the cavity, bringing the spin-photon system at the strong coupling threshold.
Besides its interest for quantum information, this works sheds new light on the artificial coupling between the spin and the orbital motion of the electron, which could be extended for synthesizing topological matter.

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